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Stability analysis of concrete slabs in plunge pool downstream of large dam
Liu Peiqing (Beijing University of Aeronautics and Astronautics)
Hou Jianguo (Water
Resources Department of Shanxi Proviure)
Abstract The random vibration theory is
appiled to analyze the lifting process of the concrete slabs of the plunge pool downstream
of large dam.The statistical relationship between the random vibration of the slabs and
fluctuating uplift and the stability condition of slabs are presented.
Key words slab,stability condition,random theory.
Analysis of 3-D cavity flow
field in the runner of
mixed-flow hydraulic turbine
Abstract The numerical simulation and a
new cavity model for the 3-D cavity flow field in the runner of a mixed-flow turbine are
presented in this paper.The comparison of the turbine model cavitation test with the
numerical analysis for the model runner of the Yantan hydraulic power station, show that
the numerical methed is accurate and can be used in practice.
Key words Cavitation,Flow analysis,Hydraulic turbine.
Analysis and prediction of eutrophication for Miyun Reservoir
Chen Yongcan Zhang Baoxu Lu Yuliang
(Tsinghua University)
Abstract The eutrophication
situation of the Miyun Reservoir is evaluated in this paper.According to the
characteristics of the Miyun reservoir the complete-mixing system model is
established.Apparent settling velocity S of TP is obtained on the basis of the 10-year
observed data before 1995.The developed model is applied to simulate the eutrophication of
the reservoir.
Key words Miyun reservoir,eutrophication,complete-mixing system model.
Study on the
method for predicting the environmental absorbability
of water in a river basin
Liu Lanfen Zhang Xiangwei
(China Institute of Water Resources and Hydropower Research)
Xia Jun
(Wuhan University of Hydraulic and Electric Engineering)
Abstract This paper emphasizes
that the environmental absorbability of water is the basis for the control of total amount
and for decision making of water environment harnessed plan.A method for predicting
environmental absorbability is deduced.The method is suitable for the prediction of the
basins of medium or small rivers.
Key words environmental absorbability of water,control for total amount of
pollutants,pollution load.
Analysis of optimization of the Yellow River hydrological station network
Zhao Liming (Tianjin University)Abstract The optimization of
networking is vital in the establishment of hydrological station network.On the basis of
controlling the variation of time and space,the optimized distribution of the hydrological
station network is analyzed by using economic method.
Key words optimization, hydrological station network， Yellow River, research.
Modeling of surface
runoff based on raster system in GIS for
rain-harvesting agriculture
Liang Tiangang Zhang Shenlei Dai Ruolan Xu
Yuqing
(The state key lab of Arid Agroecology Lanzhou University)
Abstract By means of GIS
method,the digital elevation model(DEM)is established,the flow direction,flow
accumulation,sub-catchment boundaries and stream network spatial distribution are
studied.Based on raster system and Rasterized Runoff Coefficient Method (RRCM),the spatial
distribution of annual average runoff is modeled.Meanwhile,the runoff in the simulated
natural catchments is also simulated with the precipitation of 10,20,30,40,50 and 60mm.The
results indicate that not only the spatial distribution of large stream network can be
simulated but also the small water path by DEM and the runoff in each sub-catchment can be
quickly calculated by RRCH.It is important in planning the rain-harvesting engineering in
semi-arid area.
Key words geographic information system, raster, digital elevation model, rain-harvesting
agriculture,flow direction,runoff simulation.
Han longxi Jin Zhongqing
(Hohai University)
Abstract In this paper, the method called
channel-junction-channel is used to establish water quantity and water quality
mathematical model of Nantong river net. In water quantity model the optimization method
is used to calibrate channel's roughness. In water quality model a formula of calculating
source term of life was prescribed. The model was successfully used in Nantong district.
Key words river net, water quantity model, water quality, optimization method.
Research on water and
heat transfer in SPAC of winter wheat
in Yerqiang irrigation area
Mao Xiaomin Yang Shixiu Lei Zhidong
(Tsinghua University)
Abstract Based on the theory of soil water
dynamics, micrometeorology and energy balance, a model of water and heat transfer in the
Soil-Plant-Atmosphere Continuum (SPAC) is established. The numerical simulation is
realized by using implicit finite difference discretization and iteration method with an
automatically changing time step. Based on the data collected from the Xinjiang Yakand
River Ground Water Balance Station the model is tested. The result of evapotranspiration,
water and heat condition during winter wheat growing period from greening to mature is
analyzed and discussed. It shows that this model can simulate the process of water and
heat transfer in the soil and canopy and the water consumption in the field, which is very
important for soil moisture prediction and evapotranspiration research in agriculture.
Key words SPAC, water and heat transfer,evapotranspiration, energy balance, numerical
simulation.
Relationship between
quality ad quantity and durability of
galvanized welded mesh ferro-cement
Xiong Guangjing
(Shantou University)
Gurdev Singh
(The University of Leeds, Leeds, UK)
Abstract An explanation shows that some
predictions of durability of mortar cover by using behavior of concrete cover are not
reliable. A long-term experimental study with more than 100 ferro-cement specimen
subjected to a joint action of load-NaCl or acidic solution has been performed. laboratory
experimental results are integrated with field observations to demonstrate that good
durability of welded mesh ferro-cement can be obtained provided that quality of mortar
cover with a thickness of 5mm is ensured.
Key words galvanized welded mesh, welded mesh ferro-cement, cover thickness, cover quality,
durability.
Suction prediction on slope stability of expansive soils
Miao Linchang Yin Zongze
(Hohai University)
Yan Mingliang
(Nanjing Institute of mechanical and Electrical Engineering)
Abstract In this paper the method for
predicting suction with the artificial neural network in studied. The research results
show that the method is very effective. It can be applied to practical engineering and is
very advantageous to predict the slope stability of expansive soils in early stage.
Key words expansive soils, slope stability, suction prediction, artificial neural network.)
Rigid－Body Interface Element Method (RIEM) in analysis of
thermal field thermal stress and creeping stress
Fang Yilin Zhuo Jiashou
(Hohai University)
Abstract Formulae for solving thermal
field problems have been derived using RIEM, which can be used for both continuous and
discontinuous thermal field problems. Formulae for solving thermal stress and creeping
stress have been presented as well. Numerical examples show that the methods in this paper
are reasonable and feasible.
Key words RIEM, thermal field, thermal stress, creeping stress.
Four-freedom
complete method for the seepage-stress coupled analysis in
fissured rock masses
Wang Yuan Xu Zhiying Shu Baoyu
(Hohai University)
Abstract In this paper, a new method
called Four-Freedom Complete Method for solving the seepage-stress coupled problem in the
fissured rock masses is presented. In this method, not only the change of fissure
permeability with stress is considered, but also seepage pressure and displacement are
taken as unknown variables simultaneously. The new method can overcome the shortcomings of
the ordinary method in whioch two fields are alternately iterated, and make the coupled
problem become more simple.
Key words seepage, stress, fissured rock masses, rock mechanics, finite element method.
Study on similarity of
local scouring of cohesive material
in hydraulic model test
Zhou Mingde
(Nanjing Hydraulic Research Institute)
Abstract Based on the experimental data,
an empirical formula for calculation of equivalent grain size of cohesive material in
hydraulic model test is presented. Satisfactory result was obtained.
Key words sluice, cohesive material, scouring simulation.
Risk Calculation model for flood levee structure
Wang Zhuofu Yang Gaosheng(HoHai
University)
Zhang Zhiqiang(Nanjing Yangtze River Management Bureau)
Abstract In this paper the structure risk
is established several kinds of uncertainties of soil is defined and the mathematical
model for flood levee risk is analyzed with MC method. The structure risk is calculated.
It is indicated that the structure risk, compared with hydrological risk, is important.
Key words flood levee, uncertainties, risk, MC method.
Simulation of the effects of
soil water condition on
winter wheat growth
Abstract Based on the crop growth model
MACROS(L1D),a dynamic coupling model for crop growth,water and balance in field was
established. The model includes three submodels:cropgrowth water transmission in SPAC
system and coupling relationship between crop growth and soil water conditions.This paper
focus on the discussions of the coupling relationship between soil water condition and
crop growth.Comparing with the field experiment,the simulation results of winter wheat
growth and the sensitivities of some parameters for the coupling relations in the model
were analyzed.By using this model,the effects of soil water conditions on winter wheat
production in rainy region of southern China were simulated and some methods to improve
soil conditions for wheat production were discussed.
Key words winter wheat,SPAC water movement,production model,compling of water and crop
growth.
Bayesian dynamic model in data analysis of dam monitoring
Wang Shuyu Liu Guohua Liu
Lijun Li Fuqiang
(Zhejiang University)
Abstract This paper
discusses the dynamic analysis of observational data of dams, including Bayesian linear
dynamic model, recursion algorithm, preliminary priori estimation and determination of
state noise distribution etc.. The method has been applied to one practical example.
Results show that the Bayesian predications is in better accuracy than that by
conventional least square method. In addition, the method can be adopted in on-line
monitoring.
Key words Bayesian model, dynamic analysis, dam monitoring.
Computation of the flow in front of a turbine runner
Qian Hanxin
(Tsinghua University)
Zhang Lefu
(Harbin Large Electrical Machinery Institute)
Abstract A computational method to
determine the distributions of meridional velocity and circulation at inlet of turbine
runner by using the S1,S2 stream surfaces iteration method is
introduced. As compared with the measured result, its calculated results are more
reasonable than that by traditional design method.
Key words turbine, flow computation, in front of runner.